At this moment in Thailand. Most of bank rush to release their mobile application with wallet to benefit from national standardize QR-code.
Kbank is major player now but SCB in the news on link above try to catch up with them. At the end it is the game of getting market share of mobile banking.
However, if Thai people travel to Japan, Korea or Europe. Omise can gain advantage fro customer to use the same wallet of Thai bank to pay merchant at other country without exchange fiat.
Or Omise can partnering with anyone to do Cash In/Out as they plan to exchange any unused Thai Baht coin and note to any prefer fiat right to tourist wallet. I think this could gain a lot of tourist attraction. You know right how many people visit Thailand per year?